Hcg levels rising but not doubling


Hey all, my husband and I have been ttc for 3 years. We have had a miscarriage and ectopic. I recently late last week found out I was pregnant! However my hcg levels are low so the suspect me to be early on. My first beta draw was 27, two days later 41, another two days later 69. My doctor said she happy with my numbers and optimistic. Did anyone else have low and slow rising hcg but a normal healthy pregnancy?